Lock.



PATENTED OUT. 15,1907.

No. 868,235. I

H. G. VOIGHT. LOCK. urmonmn rmm JULY 16, 1907. I 2 SHEETS-SHEET 1.

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PATENTED OCT. 15, 1907. H. G. VOIGHT.

LOGK.

APPLICATION FILED JULY 16, 1907.

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THE-NORRIS PETERS co.. wAsuiucrmv. o. c.

UNITED STATES PATENT OFFICE.

IIENRY G. VOIGHT, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR 'IO RUSSELL dzERWIN MANUFACTURING COMPANY, OF NEW BRITAIN, CONNECTICUT, A CORPORATIONOF.

CONNECTICUT.

LOCK.

Specification of Letters Patent.

Patented Oct. 15, 1907.

To all whom it may concern:

Be it known that l, HENRY G. VOIGHT, a citizen of the United States,residing at New Britain, county of Hartford, State of Connecticut, haveinvented certain new and useful Improvements in Locks, of which thefollowing is a full, clear, and exact description.

My invention relates to improvements in locks, particularly to that typein which there is a protected slot provided through the escutcheonplates to permit of the insertion of mail matter.

Heretofore, in such locks itwas possible to introduce an instrumentthrough the slot and manipulate the mechanism at the inner side of thelock, so as to operate the same and gain access to the room, which sucha lock was supposed to protect. It is to defeat this method of attackthat my invention is particularly designed.

In the accompanying drawingsFigure 1 is a front elevation of myinvention as applied to one type of lock, the protective flaps beingpartially open; Fig. 2 is a view of the inner side of one of theescutcheon plates, showing a portion of the locking mechanism, and theblocking device therefor; Fig. 3 is a horizontal crosssection of Fig. 1on the plane of the line xx looking down, but with the protecting flapsclosed; Fig. 4 is a side view of a detail; Fig. 5 is a view of the samedetail taken from the lower edge; Fig. 6 is a view partly in section ofanother detail.

1 is an inside escutcheon plate.

2 is an outside escutcheon plate.

3 is a face-plate.

4 -5 are inner and outer knobs respectively.

6 is a latch.

7-7 are push-buttons, which represent conventionally the usualwell-known stop-work mechanism employed to dog the outer knob 5 wheneverdesired. The construction of this stop-work mechanism is so wellunderstood as to require no explanation, one form th ereof' being shownin my former patent No. 574506 to which reference is hereby made.Through the escutcheon plates 1 and 2 are passages or slots of asuitable size to admit of the passage of mail matter, and 89 representrespectively protective flaps, preferably hinged to their respectiveescutcheon plates and connected by a link 10, whereby the same will movetogether.

11. is a coil spring which may be suitably mounted, say on the bearingof the flap 8, in such a manner as to cause said flap to stand closed,as shown in Fig. 3. When this flap is closed, obviously the flap 9 willbe closed through the action of the link 10.

12 is the latch-slide making suitable connection with the latch-bolt 6and operated by suitable roll-backs, one of which is provided for eachof the knobs 4 and 5. One of these roll-backs is shown in Fig. 2 at 14.By turning either of the knobs 4 or 5 (when the stop-work mechanism isoff) the latch-bolt 6 may be retracted through the work mechanism 7 ison, the outer knob 5 cannot be turned, and hence the door is aseffectively locked as though the latch-bolt 6 were a dead-bolt. Were itnot for my improved 'mechanism, a suitable instrument could be insertedthrough the slot covered by the flaps 8-9 and the door could be openedby manipulating the free knob 4 at the inside. To prevent this, however,I provide cooperative means between one or both of the flaps 8-9 and thelatch mechanism, whereby when the flaps 8-9 are open, the latchmechanism will be dogged and this method of attack renderedunsuccessful. This cooperating mechanism comprises a bolt 15, orequivalent device, arranged to engage at the proper time a stopshoulder16, or equivalent device, on slide 12.

17 is a lever-arm pivoted at one end to the escutcheon plate 1, and atthe other end to the bolt 15. This member 17 carries an extension 17which is operated upon by a cam 18, in turn carried by flap 9. This camis best seen in Fig. 6 and preferably has an abrupt shoulder 18*,whereby, the instant the flaps 89 are opened, the lever 17 will be movedso as to project the bolt 15 into a position where it dogs thelatch-work mechanism which, in the special from shown, would occur whenthe end of the bolt 15 stands to the rear of the shoulder 16 (see Fig.2). The projection 17 is of a suitable contour to avoid unnecessaryfriction between it and the cam 18. So long as the flaps 89 stand open,some part of the curved face 18 will stand against the lever extension17'', so as to positively block the latch mechanism, thus making itimpossible to efiect an entry by the use of any instrument insertedthrough the letter passage.

It should be understood, of course, that when this lock is applied tothe door, the escutcheon plates are securely braced against the oppositesides thereof, in the usual manner, and the passage for the mail isformed through the door stile so as to register properly with the slotsin the escutcheon plate.

obvious to require illustration.

What I claim is HENRY G. VOIGH'I. Witnesses M. S. Wmno,

EMMA W. FISH.

This, of course, is too-

